ABAP Select data from SAP table WLF_TAX_DATA_KUNNR into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WLF_TAX_DATA_KUNNR table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to WLF_TAX_DATA_KUNNR. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the WLF_TAX_DATA_KUNNR table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_WLF_TAX_DATA_KUNNR TYPE STANDARD TABLE OF WLF_TAX_DATA_KUNNR,
      WA_WLF_TAX_DATA_KUNNR TYPE WLF_TAX_DATA_KUNNR,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <WLF_TAX_DATA_KUNNR> TYPE WLF_TAX_DATA_KUNNR.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_WLF_TAX_DATA_KUNNR.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM WLF_TAX_DATA_KUNNR
  INTO TABLE IT_WLF_TAX_DATA_KUNNR.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WLF_TAX_DATA_KUNNR
*  INTO TABLE @DATA(IT_WLF_TAX_DATA_KUNNR2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_WLF_TAX_DATA_KUNNR INDEX 1 INTO DATA(WA_WLF_TAX_DATA_KUNNR2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_WLF_TAX_DATA_KUNNR ASSIGNING <WLF_TAX_DATA_KUNNR>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WLF_TAX_DATA_KUNNR>-KUNNR = 1.
<WLF_TAX_DATA_KUNNR>-ALAND = 1.
<WLF_TAX_DATA_KUNNR>-LAND1 = 1.
<WLF_TAX_DATA_KUNNR>-STCEG = 1.
<WLF_TAX_DATA_KUNNR>-TAXK1 = 1.

ENDLOOP.

LOOP AT IT_WLF_TAX_DATA_KUNNR INTO WA_WLF_TAX_DATA_KUNNR.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WLF_TAX_DATA_KUNNR-TAXK2, sy-vline,
  WA_WLF_TAX_DATA_KUNNR-TAXK3, sy-vline,
  WA_WLF_TAX_DATA_KUNNR-TAXK4, sy-vline,
  WA_WLF_TAX_DATA_KUNNR-TAXK5, sy-vline,
  WA_WLF_TAX_DATA_KUNNR-TAXK6, sy-vline,
  WA_WLF_TAX_DATA_KUNNR-TAXK7, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WLF_TAX_DATA_KUNNR you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_WLF_TAX_DATA_KUNNR TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_WLF_TAX_DATA_KUNNR INTO WA_WLF_TAX_DATA_KUNNR.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit ALPHA, internal->external for field KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WLF_TAX_DATA_KUNNR-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_TAX_DATA_KUNNR-KUNNR.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_WLF_TAX_DATA_KUNNR_STR, 
KUNNR TYPE STRING,
ALAND TYPE STRING,
LAND1 TYPE STRING,
STCEG TYPE STRING,
TAXK1 TYPE STRING,
TAXK2 TYPE STRING,
TAXK3 TYPE STRING,
TAXK4 TYPE STRING,
TAXK5 TYPE STRING,
TAXK6 TYPE STRING,
TAXK7 TYPE STRING,
TAXK8 TYPE STRING,
TAXK9 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WLF_TAX_DATA_KUNNR_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_WLF_TAX_DATA_KUNNR_STR-KUNNR sy-vline 
WA_WLF_TAX_DATA_KUNNR_STR-ALAND sy-vline 
WA_WLF_TAX_DATA_KUNNR_STR-LAND1 sy-vline 
WA_WLF_TAX_DATA_KUNNR_STR-STCEG sy-vline 
WA_WLF_TAX_DATA_KUNNR_STR-TAXK1 sy-vline 
WA_WLF_TAX_DATA_KUNNR_STR-TAXK2 sy-vline 
WA_WLF_TAX_DATA_KUNNR_STR-TAXK3 sy-vline 
WA_WLF_TAX_DATA_KUNNR_STR-TAXK4 sy-vline 
WA_WLF_TAX_DATA_KUNNR_STR-TAXK5 sy-vline 
WA_WLF_TAX_DATA_KUNNR_STR-TAXK6 sy-vline 
WA_WLF_TAX_DATA_KUNNR_STR-TAXK7 sy-vline 
WA_WLF_TAX_DATA_KUNNR_STR-TAXK8 sy-vline 
WA_WLF_TAX_DATA_KUNNR_STR-TAXK9 sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.